Sorry to give you bad news, but migrating FCP doesn't work. There are bits and pieces of things it needs installed throughout the operating system. Codecs and QT components installed in the LIBRARY and SYSTEM LIBRARY, plugins, FX Plug components. Those don't get migrated when you use the MIGRATION ASSISTANT.

Only a full install from the installer discs will put all the proper components where they need to go.

I don't know of a list. There are so many files...a dozen or so, scattered over the main LIBRARY and then the SYSTEM>Library. There's and app called FCS REMOVER that will trash all of them, so the author of that must know what is where.

so i'm running 7.0.3, since 2010. took a hiatus from FCP, and am now into it again, and seeing these errors contantly.

i may have "non-standard or too-large frame sizes on the timeline", here's my situation: i started editing HDV videos on my FCP originally (never varied system settings since then), but recently have been throwing in iphone video footage to the mix, mp3s and .wav files.

would that impact it? always self taught on FCP, and i'm relearning it again.